Fuel discharge member, a burner, a premixing nozzle of a combustor, a combustor, a gas turbine, and a jet engine

Abstract

This invention relates to a fuel discharge member which can reduce the amount of NOx exhaust. The fuel discharge member is fixed on a fuel supply conduit, and comprises: a main body having an internal space which communicates with a fuel passage in the fuel supply conduit, fuel discharge outlets which communicate with the internal space, and a trailing edge. The thickness of the trailing edge is no more than 5 mm, or a flow passage block ratio of the fuel discharge member is no more than 10% with respect to the cross-sectional area of the air flow passage in which the fuel discharge member is to be placed. Alternatively, the main body is a flat tube.

1 . A fuel discharge member to be fixed on a fuel supply conduit, comprising: a main body having an internal space which communicates with a fuel passage in the fuel supply conduit; fuel discharge outlets which communicates with the internal space; and a trailing edge, 
 wherein the thickness of the trailing edge is no more than 5 mm, or a flow passage block ratio of the fuel discharge member is no more than 10% with respect to the cross-sectional area of the air flow passage in which the fuel discharge member is to be placed.    
     
     
         2 . A fuel discharge member according to  claim 1 , wherein the fuel discharge outlets open toward a substantially perpendicular direction to the air flow passage.  
     
     
         3 . A fuel discharge member according to  claim 1 , wherein the trailing edge of the main body is inclined so that the base end of the trailing edge extends further downstream from the tip end of the trailing edge with respect to the air flow which is to be formed in the air flow passage.  
     
     
         4 . A fuel discharge member according to  claim 3 , further comprising a detachable inclined member, which forms the trailing edge.  
     
     
         5 . A fuel discharge member according to  claim 1 , wherein the fuel discharge outlets are axially arranged in a plurality of lines and radially staggered on the main body.  
     
     
         6 . A fuel discharge member according to  claim 1 , wherein the fuel discharge outlets open toward the downstream direction with respect to the air flow.  
     
     
         7 . A fuel discharge member according to  claim 1 , wherein the cross-sectional shape of the main body is a flat oval shape, an elliptical shape, or an annular shape, and the trailing edge is formed with a protruding portion at the downstream side with respect to the air flow.  
     
     
         8 . A fuel discharge member to be fixed on a fuel supply conduit, comprising: a main body having an internal space which communicates with a fuel passage in the fuel supply conduit; fuel discharge outlets which communicate with the internal space; and a trailing edge, 
 wherein the main body is a flat tube.    
     
     
         9 . A fuel discharge member according to  claim 8 , wherein the fuel discharge outlets open toward a substantially perpendicular direction to the air flow passage.  
     
     
         10 . A fuel discharge member according to  claim 8 , wherein the trailing edge of the main body is inclined so that the base end of the trailing edge extends further downstream from the tip end of the trailing edge with respect to the air flow which is to be formed in the air flow passage.  
     
     
         11 . A fuel discharge member according to  claim 10 , further comprising a detachable inclined member, which forms the trailing edge.  
     
     
         12 . A fuel discharge member according to  claim 8 , wherein the fuel discharge outlets are axially arranged in a plurality of lines and radially staggered on the main body.  
     
     
         13 . A fuel discharge member according to  claim 8 , wherein the fuel discharge outlets open toward the downstream direction with respect to the air flow.  
     
     
         14 . A fuel discharge member according to  claim 8 , wherein the flat tube has a cross-sectional shape of a flat oval shape or an elliptical shape.  
     
     
         15 . A burner comprising: 
 a fuel supply conduit in which a fuel passage is formed which communicates with a fuel supply source;    a fuel discharge member according to  claim 1;  and    swirlers which are fixed on the fuel supply conduit so as to rotate an air flow or a premixed gas flow containing air and fuel.    
     
     
         16 . A burner according to  claim 15 , wherein the fuel discharge members are arranged axially in a plurality of lines.  
     
     
         17 . A burner according to  claim 16 , wherein the fuel discharge members are so disposed so as to be circumferentially displaced with respect to each other.  
     
     
         18 . A burner according to  claim 15 , wherein the swirlers are disposed downstream of the fuel discharge members with respect to the air flow, and are circumferentially aligned with the fuel discharge members.  
     
     
         19 . A burner according to  claim 15 , wherein the swirlers are disposed downstream of the fuel discharge members with respect to the air flow, and the swirlers and the fuel discharge members are circumferentially staggered with respect to each other.  
     
     
         20 . A burner according to  claim 15 , wherein the fuel supply conduit further comprises: a liquid fuel passage which communicates with a liquid fuel supply source; and fuel discharge outlets which communicate with the liquid fuel passage substantially at the tip end portions of the fuel supply conduit.  
     
     
         21 . A burner comprising: 
 a fuel supply conduit in which a fuel passage is formed which communicates with a fuel supply source;    a fuel discharge member according to claim  8 ; and    swirlers which are fixed on the fuel supply conduit so as to rotate an air flow or a premixed gas flow containing a air and fuel.    
     
     
         22 . A burner according to  claim 21 , wherein the fuel discharge members are arranged axially in a plurality of lines.  
     
     
         23 . A burner according to  claim 22 , wherein the fuel discharge members are so disposed so as to circumferentially displaced with respect to each other.  
     
     
         24 . A burner according to  claim 21 , wherein the swirlers are disposed downstream of the fuel discharge members with respect to the air flow, and are circumferentially aligned with the fuel discharge members.  
     
     
         25 . A burner according to  claim 21 , wherein the swirlers are disposed at downstream of the fuel discharge members with respect to the air flow, and the swirlers and the fuel discharge members are circumferentially staggered with respect to each other.  
     
     
         26 . A burner according to  claim 21 , wherein the fuel supply conduit further comprises: a liquid fuel passage which communicates with a liquid fuel supply source; and fuel discharge outlets which communicate with the liquid fuel passage substantially at the tip end portions of the fuel supply conduit.  
     
     
         27 . A premixing nozzle of a combustor, comprising: 
 a pilot burner disposed on a central axis of the premixing nozzle; and    a plurality of burners according to  claim 15  or  20 , which are disposed as main burners surrounding the pilot burner.    
     
     
         28 . A combustor comprising: 
 a premixing nozzle according to claim  27 ; and    a cylinder which holds the premixing nozzle therein.    
     
     
         29 . A gas turbine comprising: 
 a compressor which compresses an air to generate a high-pressure gas;    a combustor according to  claim 28 , which is connected to the compressor so as to be supplied with the high-pressure gas from the compressor, and which heats the high-pressure gas to generate a high-temperature and high-pressure gas; and    a turbine which is connected to the combustor so as to be supplied with the high-temperature and high-pressure gas from the combustor, and which rotates an out shaft by expanding the high-temperature and high-pressure gas to generate a shaft output.    
     
     
         30 . A jet engine comprising: 
 a compressor which compresses an air to generate a high-pressure gas;    the combustor according to  claim 28 , which is connected to the compressor so as to be supplied with the high-pressure gas from the compressor, and which heats the high-pressure gas to generate a high-temperature and high-pressure gas; and    a turbine which is connected to the combustor so as to be supplied with the high-temperature and high-pressure gas from the combustor.